WARRENVILLE,Ill.–(BUSINESS WIRE)–Navistar,Inc. today announced that it will remain the exclusive provider of Class 8 tractors for truckload carrier Heartland Express,Inc. The agreement calls for the delivery of International® ProStar®+ tractors with EPA 2010 MaxxForce® 13 engines. “Receiving another significant order from a major customer like Heartland Express continues to demonstrate the confidence of the marketplace in the performance and fuel economy of our 2010 MaxxForce Advanced EGR e
